<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Application
 * @subpackage Resource
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Db.php 24297 2011-07-29 00:11:25Z adamlundrigan $
 */

/**
 * @see Zend_Application_Resource_ResourceAbstract
 */
require_once 'Zend/Application/Resource/ResourceAbstract.php';

/**
 * Resource for creating database adapter
 *
 * @uses       Zend_Application_Resource_ResourceAbstract
 * @category   Zend
 * @package    Zend_Application
 * @subpackage Resource
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Application_Resource_Db extends Zend_Application_Resource_ResourceAbstract {
	/**
	 * Adapter to use
	 *
	 * @var string
	 */
	protected $_adapter = null;
	
	/**
	 * @var Zend_Db_Adapter_Abstract
	 */
	protected $_db;
	
	/**
	 * Parameters to use
	 *
	 * @var array
	 */
	protected $_params = array ();
	
	/**
	 * Wether to register the created adapter as default table adapter
	 *
	 * @var boolean
	 */
	protected $_isDefaultTableAdapter = true;
	
	/**
	 * Set the adapter
	 *
	 * @param  string $adapter
	 * @return Zend_Application_Resource_Db
	 */
	public function setAdapter($adapter) {
		$this->_adapter = $adapter;
		return $this;
	}
	
	/**
	 * Adapter type to use
	 *
	 * @return string
	 */
	public function getAdapter() {
		return $this->_adapter;
	}
	
	/**
	 * Set the adapter params
	 *
	 * @param  string $adapter
	 * @return Zend_Application_Resource_Db
	 */
	public function setParams(array $params) {
		$this->_params = $params;
		return $this;
	}
	
	/**
	 * Adapter parameters
	 *
	 * @return array
	 */
	public function getParams() {
		return $this->_params;
	}
	
	/**
	 * Set whether to use this as default table adapter
	 *
	 * @param  boolean $defaultTableAdapter
	 * @return Zend_Application_Resource_Db
	 */
	public function setIsDefaultTableAdapter($isDefaultTableAdapter) {
		$this->_isDefaultTableAdapter = $isDefaultTableAdapter;
		return $this;
	}
	
	/**
	 * Is this adapter the default table adapter?
	 *
	 * @return void
	 */
	public function isDefaultTableAdapter() {
		return $this->_isDefaultTableAdapter;
	}
	
	/**
	 * Retrieve initialized DB connection
	 *
	 * @return null|Zend_Db_Adapter_Abstract
	 */
	public function getDbAdapter() {
		if ((null === $this->_db) && (null !== ($adapter = $this->getAdapter ()))) {
			$this->_db = Zend_Db::factory ( $adapter, $this->getParams () );
		}
		return $this->_db;
	}
	
	/**
	 * Defined by Zend_Application_Resource_Resource
	 *
	 * @return Zend_Db_Adapter_Abstract|null
	 */
	public function init() {
		if (null !== ($db = $this->getDbAdapter ())) {
			if ($this->isDefaultTableAdapter ()) {
				Zend_Db_Table::setDefaultAdapter ( $db );
			}
			return $db;
		}
	}
	
	/**
	 * Set the default metadata cache
	 *
	 * @param string|Zend_Cache_Core $cache
	 * @return Zend_Application_Resource_Db
	 */
	public function setDefaultMetadataCache($cache) {
		$metadataCache = null;
		
		if (is_string ( $cache )) {
			$bootstrap = $this->getBootstrap ();
			if ($bootstrap instanceof Zend_Application_Bootstrap_ResourceBootstrapper && $bootstrap->hasPluginResource ( 'CacheManager' )) {
				$cacheManager = $bootstrap->bootstrap ( 'CacheManager' )->getResource ( 'CacheManager' );
				if (null !== $cacheManager && $cacheManager->hasCache ( $cache )) {
					$metadataCache = $cacheManager->getCache ( $cache );
				}
			}
		} else if ($cache instanceof Zend_Cache_Core) {
			$metadataCache = $cache;
		}
		
		if ($metadataCache instanceof Zend_Cache_Core) {
			Zend_Db_Table::setDefaultMetadataCache ( $metadataCache );
		}
		
		return $this;
	}
}
